CAJ | 학술논문

为了测量机械设备中的薄油膜厚度分布,对超声测量薄油膜厚度分布的方法进行了理论研究.基于声波在三层介质中传播的相关理论,对中间层油膜厚度远小于油膜中入射声波波长的情况,结合具体边界条件,建立斜入射时超声波在三层介质中传播的反射系数弹簧模型,获得反射系数和油膜刚度的函数关系,进而由刚度获得油膜厚度;分析超声波入射频率、入射角度和油膜厚度对反射系数的影响规律,通过测量油膜中各点的反射系数即可获得相应点的油膜厚度,实现油膜厚度分布的测量.
위료측량궤계설비중적박유막후도분포,대초성측량박유막후도분포적방법진행료이론연구.기우성파재삼층개질중전파적상관이론,대중간층유막후도원소우유막중입사성파파장적정황,결합구체변계조건,건립사입사시초성파재삼층개질중전파적반사계수탄황모형,획득반사계수화유막강도적함수관계,진이유강도획득유막후도;분석초성파입사빈솔、입사각도화유막후도대반사계수적영향규률,통과측량유막중각점적반사계수즉가획득상응점적유막후도,실현유막후도분포적측량.
@@@@For measuring thin oil-film thickness distribution in the mechanical equipments,the measurement of thin oil-film thickness distribution by using ultrasonic technique was theoretically studied. Based on the related theory of the a-coustic propagation in three layers of media and considered the boundary conditions,a spring model of reflection coeffi-cient was constructed to simulate the propagation of oblique incidence ultrasound in three layers of media on condition that the oil-film thickness was far less than the wavelength. The functional relationship between reflection coefficient and the stiffness of the oil-film can be obtained from this model. The oil-film thickness can be got from the stiffness. The influence of the incident angle,frequency and the oil-film thickness on the reflection coefficient was studied. Each reflection coeffi-cient measured corresponds to the thickness of a point on the oil-film,and the oil-film thickness distributions can be extrac-ted from these reflection coefficients via this model.